Yielding concave for threshers.



Patented Apr. 13, 190:1

0. W. CLARK. mmm ooucxvz For; mzsms.

PPLIOATIO FILED HAY 2, 1908 Wsten@ Wmo CHARLES W. CLARK, OF SIESTON, MISSOURI.

YIELDING CONCAVE FOR THRESIERS.

Specification o! Letters Patent.

Patented Apnl 13, 1909.

Application med may 2, isos. serial No'. 430,552.

To all 'whom 'it may conce-rn:

Be it known that I, ('rnAnLns W. CLARK, a citizen of the United States, residing at Sikeston,in th county of ScottI and State of Missouri, have invented new and useful 1mprov ements in Yielding Concaves .for Threshers, of which the following is a speciicatimi.

' This invention relates to threshing machines or separators, and more particularly E to concaves, therefore, and has for an objectto provide means whereby the concave may be yieldingly supported beneath its cylinder whereby it may be automatically adjusted toward and away from the cylinder according to the amount of grain fed and its condition and to allow free passage of foreign matter. t

A further object of this invention is to provide a. concave as set forth abo've which will be simple in construction, which can be conveniently applied to machines of ordinary construction without change thereto and which will eil'ectively serve to prevent elogging or chokingr between the cylinder and concave incident to the passing of a compact mass of heavy or wet grain'.

A further object of this invention is to prU vide means whereby the concave may onlv yield at the time of a choke and which will remain in aV fixed position under ordinaryr working or feeding of grain in its perfect. condition.

Other objects and advantages will be ripparent frontthcfollowing description taken 1n connection 'with the accompanying drawings forming a portion of this specification,

and it will of course be understood that changes in the specific structure may be made within the scopp of the claim without departing from the s lrit of the invention.

lhe invention is i lustrated in the accompanying drawings, wherein like characters indicate similar parts in the several views.

Figure 1 is a vertical longitudinal section, showing a portion of a threshing machine and the application of the present invention thereto. Fig. 2 is a horizontal section view, the c linder being removed. Fig. 3 is a detail e evational view of a portion of the yoke. Referring now more particularly to the drawings, therel is shown a portlon of a threshing machine casing A including a feed table B, of ordinary construction, and a transversely osed threshing cylinder() having the usua ,teeth D, as shown.

A concave E is disposed beneath the side bars F which are` provided at their for Y the eral ward ends with horizontally disposed ears F and at the rear ends, their arms are provided with similar ears F which are pro-l vided with horizontally disposed passages for the rece tion ofthe horizontally disposed portion 5 o a yoke 6. The yoke 6 at each end, is provided with a vert-ical rod 7 threaded at its upper end as shown at 8, and which thus .t ina ter described. Each vertical rod is thus located inwardly of the side walls of the casing A, and atthe upper ends, these rods are disposed in passages formed in the top of the casing whereby they are mounted for vertical movement. Each rod thus receives a hel ical expansion spring 10 disposed between the top of the casing and the nut-s 9 carried by the rods 7 and arranged to bear against the under sides ofthe nuts whereby the portion 5 of the yoke is held depressed at times against the tension of the springs for yieldingly supporting the rear end of the concave.

Beneath the platform B ol' the casing, and mounted at cach side of the latter, there is shown a bearing 11 each of which receiving an outwardly directed portion 12 formed at each end of a crank member 13 having a horizontally disposed portion 14 which su orts the front end of the concave and wnch is disposed with portions beneath the ears F. Each outwardly directed portion 12 of the crank member 13 is provided with a forwardly directed arm 15 each of which ,being provided with a plurality of transversely disposed and substantially V-shaped teeth 16 which ree ive the hooked ends 17 of coil retractile springs 18. It is thus obvious that the`front end of the concave is yieldingly supported in a manner similar to that of the rear end. ln order to limit the upward vmovement of the concave at the front end thereof, I provide euch side of the casing A with a stop pin 19 whereby portions of the crank 13 are normally engaged therewith as will be seen from Fig. 2 of the drawings, and it. will thus be seen that by the provision of the stop pins 19 the concave at one end will be limited mits upward movement'toward the cylinder. By the provision of the toothed portions of member 13 it will be understood that the springs may be engaged at different points to suit various occasions, and the teeth of the concave will be efl'ectivel held in spaced relation to the threshing cy inder.

' a nut 9 for a purpose to be heref f so The revisions of the nuts 9 is also such as to enab e the concave at the rear end to be moved toward or away from the threshing cylinder.

A concave us lieroin set forth and dcscribcd is simple in construct-ion, und efl'ectively serves to prevent domage to the. nn;- ehine incident to the clicking between thc cylinder and concave upon the introduction thereto of ioreign mutter, v1.6. nails, overleeding of grain o1' damp and heavy groin or the like. 1t will further be seen that the yoke 6 'and the crank 13 as constructed bj. me are such that may be applied to concnves of :my desired construction. The crank i3 :ind the springs 18 which are attached thereto normally work in opposition to the springs 1U and it will be readily apparent that the concave norr'nnlly will not in conjunction to the cylinder'in the ordinary nuinner, and will only yield upon the introduction rl' 'foreign matter or the like :is previously described. lt will be seen, that upon introducing nnitcrial :it the front end ol the conc ve the said concave will be free to inove angulfirly with respect to the cylinder should the material be weighted or should it contain foreign matter, and zitter the material reaches the point directly beneath the center of the cylinder, the said concave will be moved f vertically in a. downward direction. It will be seen that by providing the'ears l?" with passages for receiving the horizontally disposed portion 5 of the yoke 6 the concave is pivote ly mounted et its rear end, Hoving thus described the invention, what is claimed is The combination with n threshing niechine huving'a cylinder and a concave, of e yielduble yoke carried by the machine having n portieri pivotally engaged with the concave at the rear enil-tliereoi,snid yoke having threaded portions, adjusting nuts engaged cmi be nd'usted vertically, springs conliued i between the nuts and. the top portion of said nnichine, n. crunk member carried by the g inncliine supporting the conceive. at the. front end thereol, spring means connected with the machine and with the crank member, und stops carried by the nmchine and located above the crank member-lor engagi ing the saine to limit its upward movement.

in presence of two witnesses.

CHARLES W. CLARK.

Witnesses; V M. G. GRESHAM, t E. J. ltIALoNE.

with said threded portions so that the yokel ln testimony whereof l ullix my signature. 

